Attachment for drill-presses.



W. J. MACKLE.

ATTACHMENT FOR DRILL PRESSES.

APPLICATION FILED APR. 5. 1917.

Patented Oct. 23, 1917.

2 SHEETS-SHEET 1.

Patented Oct. 23, 1917.

SHEET 2.

2 SHEETS- W. J. MACKLE.

ATTACHMENT FOR DRILL PRESSES.

APPLICATION FILED APR.5. 1917.

Emgig;

WILLIAM J. MAGKLE, OF ST. LOUIS, MISSOURI.

ATTACHMENT FOR DRILL-PRESSES.

Specification of Ietters Patent.

Patented Oct. 23,, 191?.

' Application filed April 5, 1917. Serial No. 160,005.

- To all whom it may concern:

Be it known that I, WILLIAM J. MAoKnE, a citizen of the United States, residing at the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Attachments for Drill- Presses, of which the following is a specification.

This invention consists of an attachment for a drill-press by the use of which the expense of making holes through sheets of cold-pressed steel or the like is greatl reduced, their exact location insured, an the presence of burs largely eliminated.

By the use of the invention described in my Patent 1,166,613, dated January 4, 1916, relating to the making of such holes (but by punching, instead of drilling as herein described,) the cost was reduced from thirty to twelve cents per hundred holes. By this present invention, the said cost is further reduced from the said twelve to five cents per hundred holes. These figures have all been ascertained by actual practice and experience.

In the drawings, the parts are in the same position as to operation in each of the figures and like numbers of reference denote like parts wherever they occur.

Figure 1 is a front elevation of a drillpress, with this attachment thereon, showing the same in the position immediately after a hole has been drilled through a shook of steel plates or the like.

Fig. 2 is a section on the line 2-2 in- Fig. 1; and

Fig. 3 is a section on the line 33 in Fig. 1.

The material to be drilled consists of a plurality of sheets or lates of cold-pressed steel or the like forme into a shook or pack 1 fitting within and underlying a templet 2, which is of such form and size as to receive the said shook and to cause the edges of each member of the said shook to lie in the same plane, the said templet being provided with a flange 3 for this purpose. The shook 1 may be composed of any desired number of plates or sheets.

The templet 2 is provided with as many holes as the number of holes that must be drilled in the sheets of the shook 1, which holes in the said templet are arranged according to the same pattern, a. e.-, located in the same relative places as necessary in the sheets of the said shook. .For instance, when the sheets or plates comprising the said shook 1 are to be used for the tops or sides of cars or other structures, the requirements of car-building or other construction necessitates a predetermined number of holes 10- cated at predetermined places for the passage of bolts, rivets, and the like. In the use of this invention, all these holes will be drilled by the bit 4, which in so doing passes through each of a plurality of holes 5. In each hole 5 is located a metal removable bushing 6 to suit the size of the drill or bit 4, the size of such drill being varied according to the size of the holes that it is necessary to make inthe members of shook 1. The upper edge of each bushing 6 is rounded or beveled as at 7, and the bushing may be externally screw-threaded, and the removable bushing 8 is rounded as at 9 to slide therein, in order that, while precise centering of the drill 4 by the .workman is obviated, it

will accurately drill at the precise desired point by being automatically centered. by the said rounded part 9 sliding on the beveled part 7 by which the drill is centered precisely in the middle of the bushing 6 and drills the hole at its proper predetermined place. This saves the Work of marking the points at which drills are to be made and, also, obviates the difficulty of the drill operator looking for and seeing such marks, which are sometimes hard to see on account of the flow of drilling compound. Due to the fact that all the plates or sheets forming the shook 1 are of identical size and held by the flange 3 with their edges in the same plane,

the said hole that is drilled passes through each one of them in the same relative place as through its fellows, which is of great advantage in the use of the sheets in construction, because of the uniformity of the holes, the same being inevitably and in each piece in exactly the right place to match with a hole or part in another piece or part of, the construction.

If the templets are saved that are used in producingthe parts for any particular or-' der, such order can be duplicated precisely at any future time at a minimum of expense, while in the meantime bushings 6 (of standard sizes to fit standard sizes of drills) will have been used over and over again in other templets. Wooden templets are cheaper and li hter to handle than metal ones, but for drilling purposes, as herein described, a wooden templet answers as well as a metal.

one when the holes therein are provided -fore mentioned, sheets of pressed steel and the like, have heretofore been formed by punching, which is a slow and tedious proc-; ess, necessitating the separate punching of each hole in each late, it not bemg practical to punch throug a plurality of sheets or plates, because of the resiliency of the sheets or plates and their tendency to spring apart. Another objection to holes formed in this manner is that each punched hole has a bur which for most uses must be removed before utilization of the sheet or plate. Nor is it practical to use a drill to form an individual hole. The advantage from drilling instead of punching arises from simultaneously I drilling registering holes in a plurality of soon as one hole has been drilled through pieces of material intended for like uses. Heretofore. it has'been deemed unpractical and, in fact, impracticable to drill a hole through a plurality of sheetsin the manner hereinabove described, because of the natural tendency of the sheets to buckle and separate, which produces a springy or unfirm working surface for the drill, thereby retarding or preventing its action and resulting in a hole that is not clean and true, and allowing the borings or chips to crowd in between the plates. v v

The dificulties of drilling a plurality of sheets of metal as just set forth are overcome in the use of the present invention in the following manner. When first the shook 1 is placed in the templet-2, two or more clamps 10 located at suitable places bind the shook 1 in place in the templet, and as the shock a bolt 11 is passed through t e connecting hole 5 and through the said hole that has been drilled through the shock, and nut 12 is used to bind the shock tightly to the templet 2. The first holes that are drilled through the hook will be suitably located to allow as early as possible for the use of similar bolts and nuts in laces of advantage to keep the shook in p ace and get it tightly bound together and to the templet. When a suitable number of holes have been thus located in the shock, the clamps 10 are removed. The buckling tendency of the metal sheets or plates is furnaaaaia ther oflset by the weight of templet 2 and casing 13 and dependent parts an the pressure of spring 14:- The spring 14 is normally compressed, but is released by the lowering of the casing 18 by the operator, which lowering of the said casing is in advanceof the downward movement of the drill 4:. When the head 15 at the lower end of the frame 16 that extends from casing 13 is in its lowest position and resting on the templet 2 and pressure on templet 2 thereby is being exerted by the spring 14:, continuation of turning of the lever arms 17 causes the drill 4. (by means of the spur pinion 18 and rack 19) to travel downwardly and to enter the hole 5 opposite the same and to drill a hole through the shook 1, the said shook resting upon a hollow post 20 supported by table or bracket 21.

While the drill is rotating to pierce a hole through the shook 1, suitable pressure is constantly-applied to lever arms 17 to cause the said drill to travel forward and, therefore, to bore such hole. Upon completion of the drilling of such hole, the lever arms 17 are revolved in the opposite direction, which retracts bit 4: from the hole through the shock, leaving the head 15 temporarily resting on the templet 2 until the collar 22 is engaged by the lower edge of casing 13 at 23, whereupon casing 13 and dependent parts are raised, thegeby compressing spring 1 1 and elevating head 15 from contact with templet 2.

The casing 13 is thus seen to be slidable upon the hollow shaft 24 having on one of its sides the rack 19 and in which the shaft or drill spindle 25 of chuck 26 is located.

having the tapered shank, as shown, out of the hollow end 29 of the drill spindle 25, which hollow end 29 is tapered to receive the tapered shank on chuck 26.

lit should be understood that pinion 18 and rack 19 are merely conventional illustrations of a mode of advancing the drill and amociated parts and of retracting the same and that other appropriate means for that purpose may be employed.

The operation of the machine is as follows: I

A shook 1 having been assembled and clamped in a templet 2, the same is rested upon hollow post 20; the arms 17 are rotated (to the left, as shown in the drawings) the rack 19 is actuated by pinion 18 and causes the drill spindle 25 to advance, carrying with it collar 22, thereupon spring 14 assisted by gravity advances the head 15 ofethe member 13 ahead of the drill or bit 4 and imposes the weightof the said member 13 and its associated parts upon the templet 2 and shook 1', the said member 13 being spring-pressed by the spring 14, which serves additionally to press upon the shook 1. While the drill or bit 4 is being rotated by means customary in drill-presses, the rotation of arms 17 is continued, gradually feeding the same forward as the drill makes its out through the shook. When the hole has been drilled, rotation of arms 17 in the opposite direction retracts the drill, but for the moment leaves head 15 resting on templet 2, the same not being lifted therefrom until collar 22 engages the lower edge 23 of casing 13, whereupon the same is elevated to the initial position. From the foregoing it will be seen that the first forward movement of the drill causes advancement of the member 13, under the action of spring 14. This causes the head 15 in travel to operative position to precede the bit 4; but in the move ment in the opposite direction the bit 4 travels some distance before head 15 is lifted, because head 15 does not move from templet 2 until collar 22 engages edge 23.

Having thus described this invention, I hereby reserve the benefit of all changes in form, arrangement, order, or use of parts, as it is evident that many minor changes may be made therein without departing from the spirit of this invention.

I claim: I

l. The combination of a drill and a perforated templet therefor, said drill having a chuck terminating in a shoulder sloping at its forward end, a beveled lip borne adjacent to the entrance of each templet-hole, said lip being adapted slidably to engage said shoulder to guide said drill to central position relative to the hole to be drilled, and means for alining a plurality of resilient sheets or plates and holding them in alinement and in operative relation to the temlet.

p 2. The combination of a drill and a perforated templet therefor, said drill having a comparatively thick chuck to hold the drill and the said chuck having a sloping shoulder and a beveled lip forming the entrance of each templet-hole, said lip being adapted slidably to engage said shoulder and guide said chuck to a position in slidable engagement with the adjacent wall of said templetholes to direct said drill to drilling position relative to the hole to be drilled, the said templet having sufficient thickness to allow the said sloping shoulder and beveled lip to engage with each other before drilling begins and the said templet having a peripheral flange for alining the members of a shook.

3. The combination of a drill and a templet comprising a perforated plate having.

screw-threaded hollow member open at both ends adapted to be removably borne by the wall of each templet-hole, each said hollow member having an outwardly-flaring lip at its entrance, said drill being formed with a comparatively thick chuck having a sloping shoulder, said shoulder being adapted to engage the flaring lip of each templet-hole and shook, and means for binding the said shook to the said templet.

4. The combination of a drill-press having a drill or bit and means for rotating and forwarding the same, a member inclosing the means for rotating and forwarding the drill and adapted to travel longitudinally therewith, a spring abutting the said member and a part of the said press fixed against longitudinal motion in the directions of travel of the said member, a collar adapted to travel with the said forwarding means and to engage the said inclosing member.

5. The combination of forwarding the same, a work-engaging member, means to forward the same in advance of the drill, drill-returning means, and a member carried by the drill-returning means in position to engage the workengaging member and return the same following the drill.

6. The combination of a drill-press having a rotary drill adapted to be advanced longitudinally, and a device for maintaining pressure upon a shock of plates during the drilling operation, the said device comprising a spring and 'abutments therefor, a spring-pressed member, and means for retracting the said. member, the said means consisting of a 'collar actuated by the drill spindle.

a drill, means for .7. The combination of a drill-press having a rotary drill adapted to be advanced longitudinally, and a device for maintaining pressure upon a shook of metal lates during the drilling operation, the sald device comprising aspring and abutments.

against the tension of its spring-actuating means.

9. The combination with a, (hill-press e1ement.ca.rrie& hy the drill- MQMS having means for advancing and retracting of the press for moving the casing against 1.

the drill-carrying means thereof, of: a, the tension of the spring and away from spring-actuated work-homing element comthe WOIk.

' prising a casing surrounding the drill-can In testimony whereof I hereunto n my rying' means and having .a, Work-engaging siatuire. head, spring means normally tending to move the casing toward the W01k and an WILLIAM J. MACKLE, 

